SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70230bda0646e351d74cf6653ed0b24999f3c0f05f02c30b912a704965cf22c5' 
  AND token = 'HndkQwIjum7L8VqK1O+Xa03kVHN9+J+G8D/C8jvoGCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}